Engine Ecu - Toyota 4A-FE Repair Manual

·'.
EFI SYSTEM - Electronic Control System
Fl-147
[ ] [ ] Ohmmeter
r ?:
HT
Fl2489
Fl4263
3. INSPECT HEATER COIL RESISTANCE OF OXYGEN
SENSOR
Using an ohmmeter, measure the resistance between the
terminals +B and HT.
Resistance: 5.1 - 6.3
0
If the resistance is not as specified, replace the sensor.
Engine ECU
INSPECTION OF ECU
HINT: The EFI circuit can be checked by measuring the
resistance and voltage at the wiring connectors of the
ECU.
1. PREPARATION
(See page Fl-36)
2. INSPECT VOLTAGE OF ENGINE ECU
Check the voltage between each terminal of the wiring
connectors.
• Turn the ignition switch ON.
• Measure the voltage at each terminal
HINT:
• Perform all voltage measurements with the connec-
tors connected.
• Verify that the battery voltage is 11 V or more when
the ignition switch is ON position.